“He is young, supposedly fit, an athlete who seconds ago was running up and down the same field.” Muamba’s fiancée insisted he would “pull through” as Spurs announced plans to give all their players heart scans.

The 23-year-old Bolton player was still unconscious in intensive care today. His heart stopped for two hours after he fell to the ground during Tottenham’s FA Cup game against Bolton on Saturday at White Hart Lane. Assou-Ekotto also praised the medical team who raced to his aid as distraught players and fans looked on.

Mr Assou-Ekotto said: “I witnessed the magic of the moment. I saw a group of people, professionals, who were not caught up in the moment but were only focused.

“The medics who took care of him along with the medical guys from Spurs and Bolton were focused on Fabrice. They were not distracted by anything. Instead they worked, calmly and professionally, doing the things that had to be done to give Fabrice a chance.

“I am not an expert, but seeing what I saw, I know we still have Fabrice with us because of the work of these guys.”

Muamba’s fiancée Shauna Magunda, 27, urged people to “pray” for his quick recovery. She has kept a vigil at his bedside at the London Chest Hospital in Bethnal Green. She tweeted: “Fabrice WILL!! Pull through because God is good. Love u so much, keep strong we’re praying for u honey xx.”

She was joined at the star’s bedside by Muamba’s father and Bolton manager Owen Coyle, chairman Phil Gartside and club doctor Jonathan Tobin.

A joint statement from Barts and The London NHS Trust and Bolton Wanderers FC said: “Fabrice Muamba’s heart condition is stable, but he remains critically ill in intensive care.”

Tottenham’s players were due to have heart screenings. Sports cardiologist Sanjay Sharma was due to travel to the Spurs Lodge training base in Chigwell.